/*********************************************************************
 * Copyright (C) 2003 Andrew Khan
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ***************************************************************************/

package jxl.biff.formula;

import jxl.common.Logger;

import java.util.HashMap;
import java.util.Locale;
import java.util.ResourceBundle;

/**
 * A class which contains the function names for the current workbook. The
 * function names can potentially vary from workbook to workbook depending
 * on the locale
 */
public class FunctionNames {
    /**
     * The logger class
     */
    private static Logger logger = Logger.getLogger(FunctionNames.class);

    /**
     * A hash mapping keyed on the function and returning its locale specific
     * name
     */
    private HashMap names;

    /**
     * A hash mapping keyed on the locale specific name and returning the
     * function
     */
    private HashMap functions;

    /**
     * Constructor
     *
     * @param l the locale
     */
    public FunctionNames(Locale l) {
        ResourceBundle rb = ResourceBundle.getBundle("functions", l);
        Function[] allfunctions = Function.getFunctions();
        names = new HashMap(allfunctions.length);
        functions = new HashMap(allfunctions.length);

        // Iterate through all the functions, adding them to the hash maps
        Function f = null;
        String n = null;
        String propname = null;
        for (int i = 0; i < allfunctions.length; i++) {
            f = allfunctions[i];
            propname = f.getPropertyName();

            n = propname.length() != 0 ? rb.getString(propname) : null;

            if (n != null) {
                names.put(f, n);
                functions.put(n, f);
            }
        }
    }

    /**
     * Gets the function for the specified name
     *
     * @param s the string
     * @return the function
     */
    Function getFunction(String s) {
        return (Function) functions.get(s);
    }

    /**
     * Gets the name for the function
     *
     * @param f the function
     * @return the string
     */
    String getName(Function f) {
        return (String) names.get(f);
    }
}
